北美洲树龄空间分布及其影响因素  

Spatial Distribution and Influencing Factors of Tree Age in North America

作　　者：杨越之 代侦勇[2] 郑永宏[1] 胡正生 Yang Yuezhi;Dai Zhenyong;Zheng Yonghong;Hu Zhengsheng(Wuhan University,Wuhan 430079,P.R.China)

机构地区：[1]武汉大学资源与环境科学学院,武汉430079 [2]武汉大学,武汉430079

出　　处：《东北林业大学学报》2022年第10期23-26,共4页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(41771227)。

摘　　要：为研究大空间尺度下树龄的分布趋势与影响因素,以跨度52到3884 a的生长轮数据为对象,采用相关分析、散点图分析等方法,探讨了北美洲大陆树龄空间分布特征及其与海拔、经纬度、气候之间的关系。结果表明:(1)海拔对树龄的影响具有明显的空间异质性,中纬度地区海拔对树龄表现为显著的正向影响,而高纬度、低纬度地区海拔对树龄不具有显著影响,在不同经度带上海拔对树龄的影响复杂多变;(2)北美洲树龄在经度变化方向上呈现“一大一小”双峰型,在纬度变化方向上呈现单峰型,地理空间差异形成的水热差异导致了树龄差异;(3)暖湿地区树龄较小,寒冷干燥地区树龄较大,干带和冷温带是树龄最大的气候带。可见,在各种因素中,气候是造成树龄差异的根本原因,而其他因素则是通过影响气候间接影响树龄。In order to study the distribution characteristics and influencing factors of tree age on a large spatial scale, the spatial distribution characteristics of tree age in North America and its relationship with altitude, longitude, latitude, andclimate were discussed by using the data of growth rings with a span of 52 to 3 884 a. The results show that:(1)The influence of altitude on tree age shows obvious spatial heterogeneity. The altitude in the middle latitudes has a significant positive effect on tree age, while the altitude in high and low latitudes has no significant effect on tree age. The influence of altitude on tree age in different longitude belts is complex and changeable.(2)The tree age in North America presents a large and a small peak in the direction of longitude change, and a single peak in the direction of latitude change. The climate difference, which results from different geospatial, leads to the difference in tree age.(3)The tree age is smaller in the warm and humid regions, and the tree age is largerin the cold and dry regions. The dry zone and the cold temperate zone with the largest tree age. It can be seen climate is the fundamental factorthat affects tree age, while other factors indirectly affect tree age via affecting climate.

关 键 词：北美洲 树龄 空间分布 生长轮 气候 

分 类 号：S717.1[农业科学—林学]